Name: ______________________________ Period: ______ Date: _______________ Flame Test Lab I. II. III. IV. Discussion: When atoms or ions in the ground state are heated to high temperatures, some electrons may absorb enough energy to allow them to “jump” to higher energy levels. These excited state electrons are unstable and they will “fall” back to their normal positions of lower energy. As the electrons return to the ground state, the energy that was absorbed is emitted in the form of electromagnetic energy. Some of this energy may be in the form of visible light. Objective: To observe the characteristic colors produced by certain metallic ions when vaporized in a flame; and to identify an unknown metallic ion(s) by means of its flame test. Materials and Equipment: Wooden stirrers Different ions solutions Procedure 1. 2. 3. 4. 5. 6. 7. 8. 9. V. Bunsen burner Beaker of Water Put on safety goggles and apron. Go to assigned station. Light Bunsen burner. Take a wooden stirrer from metallic ion solution. Insert into flame. Hold the splint in flame for a few seconds. Do not let splint burn! Place used splint in water beaker. Record the color produced by the ion. (Record on data chart) When instructor announces switch move to next station. Repeat for all ions. Data: Station 1 Compond KCl Metallic Ion K1+ 2 LiCl Li1+ 3 CaCl2 Ca2+ 4 SrCl2 Sr2+ 5 CuCl Cu1+ 6 CuCl2 Cu2+ 7 NA Unknown Color Energy Name: ______________________________ VI. Period: ______ Date: _______________ Conclusion Questions: (Answer in complete sentences) 1. When an atom absorbs energy, the electrons move from their _________________________ state to a(n) ___________________________ state. When an atom emits energy, the electrons move from a(n) _________________________ state to their ____________________________ state and give off ___________________________. 2. How could this experiment be used in real life? 3. The alkali metals cesium and rubidium were based on their characteristic flame colors. Cesium is name after the sky and rubidium after the gem color. What color of light do you think these metals give off when heated in the flame? Explain why.